Share your desktop, screen, or content within a meeting:
1. Click the green share screen button located in the meeting controls
2. Choose the content you would like to share (eg: desktop, an internet tab, an open file, etc.)
3. Click share
Note: Mac users need to allow Zoom access to screen recording to share your screen. You can do this in your System Preferences. Select the Security & Privacy option, click the Privacy tab, scroll down to Screen Recording, and finally check the option for zoom.us.
Learn more at: Sharing your screen or desktop on Zoom and Zoom Guide